Method and apparatus for removing scale



W, NELSQN METHOD AND APPARATUS FOR REMOVENG SCALE Filed Aug., '7 s 3.926

Patented J an. i 3, 1928.

UNITED STATES WILLIAM IB. NELSON, OF FAIRFIELD, ALABAMA.

v METHOD AND APPARATUS FOR BEMOVING SCALE.

Application mea August v, 19'26. serial No. 127,843.

This invention relates Ito an improved method and means for rolling iron and steel and is particularly directed to the idea of reducing the amount of roll scale which adheres to shapes during the process of rolling the same. The invention will be apparent from the following speciiication when read in connection with the accompanying drawf ings in which` Fig. 1 is a side elevation of part of a rolling mill embodying certain features of the invention;

Fig. 2 is an end view of a portion of Fig. 1; Fig. 3 is a transverse section of a billet illustrating thestep in method of rolling;

Fig. 4 is a side elevation showing several roll stands and illustrating my method diagrammatically.

Referring in detail to the drawings, 10, 12 and 14 represent stands of a rolling mill, the rolls 16, 18 and 20 of which' are so shaped that the billet B is rolled to a concave cross-section as indicated .in Fig. 3. During the rolling operation I supply a water or other cooling medium to the billet by convenient means, as for instance, through vpipes 22 with suitable. control valves 245 therein. The water fills the concave portion of the billet for a considerable length, for example, practicallyl that length determined by the spacing of the rolls 10 and 14. It is especially advantageous to fill the concave section full of water so that the same may contact with the billet throughout a great length so as to eliiciently cool the'roll scale. Adjacent to the rolls of the stand 14:, I provide a pair of rolls26 and 28 adapted to bend or straighten the billet so as to loosen or break. off the chilled roll scale. Fig. 2 shows the billet B thus straightened. After passing through Athe rolls 26 and 28, the loosened or broken scale is blown off by means of air or other uid, discharged from a pipe 30. The shape or billet then passes to the rolls 32 of the vstand 34 and to rolls 36 or stand 3,8 where it is further reduced in cross-section or finished` or leaves these -rolls in a fiat shape, or any shape desired.

The bending rolls 2bl and 28v shown in Fig 4 are idlers and the billet 1s drawn through them by power from the rolls in the intended to cover the billets having various congurations, the idea being that the billet will hold water for a considerable portion of its length so as to thoroughly chill the roll scale.

Various modifications may be niade by those skilled in the art without departing from the invention as defined in the appended claims.

What I claim is 1. In the rolling of metal the method which consists in maintaining the billet con caved for a suitable length and holding a body of water therein, subsequently bending the billet to crack 0H the chilled scale and blowing off the scale by fluid pressure.

2. In the rolling of metal the method which consists in concaving the billet, holding a cooling medium in contact with it throughout a considerable length thereof to chill the roll scale and protect the billet from oxidation, bending the billet to loosen the scale and blowing ofi the scale.

3. An apparatus of the class described comprising rolls shaped to bend the billet transversely to a convex cross-section, means for feeding a cooling medium to the billet, rolls for bending the billet to loosen the roll scale and means for blowing off the loosened scale. i

4. An apparatus of the class described comprising rolls shaped to bend the billet transverse y to a convex cross-section, means for feeding a cooling medium to the billet, rolls for bending the billet to, loosen the roll scale and means for removing the scale thus loosened.

In witness whereof, I have hereunto signed my name.

WILLIAM e. manson. 

